Insights & Discussion
The literature overall supports an inverse association between green tea and cardiovascular disease-related health outcomes, while the included meta-analyses generally suggested an inverse association between green tea and BMI-related and blood pressure outcomes.
The evidence on green tea consumption and health outcomes presented in this review suggests green tea may be favorable for cardiovascular disease, particularly stroke, and certain cancers such as endometrial, esophageal, lung, non-Hodgkins lymphoma, oral, and ovarian cancer. More evidence is needed to assess the impact of green tea on breast, gastric, and liver cancer risk. Additional studies could also help clarify the suggested null association with certain cancer sites: colorectal, pancreatic, and prostate cancer. Possible minor adverse events on health from green tea consumption were reported in one study, however these must be interpreted cautiously within the study context and possible finer dose-response implications. The findings for green tea and diabetes risk were inconclusive. For BMI the current evidence suggests a possible weak association, while the evidence is stronger supporting a decrease in blood pressure from green tea. More studies investigating a possible association between green tea consumption and other health outcomes such as cognition, injuries, respiratory disease would be informative to more completely assess the impact of green tea on human health.
In conclusion, our review suggests green tea may have health benefits especially for cardiovascular disease and certain cancer sites.
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Our dose-response analysis indicated that moderate green tea consumption (500–1000 mL/d) was associated with a 21% to 24% lower risk of stroke.
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The meta-analysis aimed to clarify the inconsistent findings in epidemiologic studies regarding the link between green tea consumption and stroke risk. Five prospective cohort studies, involving 645,393 participants and 11,421 stroke cases, were analyzed. The summary relative risk (RR) revealed a substantial association, indicating a 26% reduction in stroke risk with the highest green tea consumption. The dose-response analysis indicated a nonlinear relationship, and compared with non-consumers, various levels of green tea intake showed progressively reduced RRs for stroke, emphasizing a potential protective effect.
The findings from the meta-analysis strongly suggest an inverse association between green tea consumption and stroke risk. Notably, the highest green tea consumption demonstrated a significant 26% risk reduction. The dose-response analysis further highlighted a nonlinear relationship, with moderate consumption levels (500–1000 mL/d) showing the most substantial risk reduction. These results provide support for recommending green tea consumption as a measure for the primary prevention of stroke.
Regular consumption of raw carrots is associated with a significant, dose-dependent reduction in lung cancer incidence, suggesting a potential cancer-protective effect attributed to polyacetylenic compounds, particularly falcarinol and falcarindiol, present in raw carrots.
2023 Nutrients Carrot Intake and Risk of Developing Cancer: A Prospective Cohort Study Deding U, Baatrup G, Kaalby L, Kobaek-Larsen M
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This research involved a long-term study of 55,756 Danish citizens over a period of more than 25 years. The focus was on investigating the relationship between regular consumption of raw carrots and the development of various cancers, predominantly adenocarcinomas and leukemia. The study assessed whether the frequency of carrot consumption influenced the incidence of lung, pancreatic, breast, prostate cancer, and leukemia. Additionally, it compared the effects of eating raw versus processed carrots.
The study found that eating raw carrots regularly was associated with a reduced occurrence of lung cancer. This link was less clear for pancreatic cancer and non-existent for breast and prostate cancer. The research suggested that the cancer-preventive properties of raw carrots could be attributed to specific compounds, namely falcarinol and falcarindiol. These compounds are not present in cooked carrots. This significant finding points towards the potential of raw carrots in cancer prevention, particularly for lung cancer.
Eating apples and apple products can enhance health by protecting the cardiovascular system, combating cancer and cognitive impairment, and improving hair growth, among other beneficial effects.
2023 Food Science & Nutrition Does an apple a day keep away diseases? Evidence and mechanism of action Zhang Y, Zeng M, Zhang X, Yu Q, Zeng W, Yu B, et al.
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The study took a comprehensive approach to evaluate the health benefits of apples and apple products by conducting a literature review of relevant clinical, epidemiological, in vitro, and in vivo studies. It involved an exhaustive search of the PubMed database for a ten-year period, sourcing studies that reported on the effects of different apple products: juices, purees, pomaces, dried apples, and extracts rich in apple bioactives.
The findings indicate that the consumption of apples and their derivations contributes to multiple aspects of human health. These products exhibited a range of protective effects against diseases such as cardiovascular conditions and cancer. Moreover, they were associated with enhanced cognitive function, facilitated hair growth, the healing of burn wounds, and improved oral health. The use of apples and apple-based products also helped to reduce UV-induced skin pigmentation, alleviated the symptoms of atopic dermatitis and cedar hay fever, and even prevented skin flushing caused by niacin. The beneficial impacts of apple consumption can be attributed to a variety of mechanisms including, but not limited to, vascular endothelial protection, blood lipid regulation, anti-inflammatory and antioxidant effects, as well as anti-invasion and antimetastatic tendencies. These results provide a significant reference point for various fields, including medicine and nutrition, contributing to their development and application.
Higher daily tea consumption, especially green tea, is linked to a lower risk of cerebral hemorrhage in adults.
2022 Acta Neurologica Belgica Tea consumption and cerebral hemorrhage risk: a meta-analysis Cheng P, Zhang J, Liu W, Sun Q, Fu Z, Lin H, et al.
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This meta-analysis uncovered evidence of a connection between tea consumption and cerebral hemorrhage risk, exploring databases including Web of Science, PubMed, Embase, and Scopus until December 2021. The synthesis utilized relative risks or odds ratios from observational studies. The pool of data included ten studies involving over 721,827 participants.
The evaluation revealed that a higher rate of tea consumption, and more specifically green tea, was significantly related to a lower risk of cerebral hemorrhage. Interestingly, this connection could be observed even when adjusted for key lifestyle factors such as alcohol consumption, fruit and vegetable intake, and physical activity. It is worth noting that the intake of tea on a daily basis demonstrated a protective effect against the risk of cerebral hemorrhage.
Regular coffee consumption, due to its bioactive compounds, may have protective effects against chronic disorders and certain neurodegenerative conditions.
2020 International Journal of Molecular Sciences Neuroprotective Effects of Coffee Bioactive Compounds: A Review Socała K, Szopa A, Serefko A, Poleszak E, Wlaź P
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The paper evaluates the neuroprotective potential of the main bioactive elements in coffee: caffeine, chlorogenic acid, caffeic acid, trigonelline, kahweol, and cafestol. The analysis is focused on the coffee beverage as a complex mixture of these bioactive compounds. The comprehensive study includes in vitro and in vivo preclinical tests to determine the specific health benefits each of these compounds can offer.
The results indicate that regular coffee intake may have defensive effects against a variety of enduring disorders; including cardiovascular disease, type 2 diabetes, obesity, and some forms of cancer. Additionally, an interesting correlation is found between coffee consumption and a lower risk of developing certain neurodegenerative conditions such as Alzheimer's disease, Parkinson's disease, and dementia. The study also highlights that regular coffee intake could possibly lower the risk of stroke. However, the study mentions that the mechanisms enabling these effects are yet to be fully understood.
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